Pipe corrugating and bending machine



C. J. HOLUB PIPE GORRUGATING AND BENDING MACHINE Filed July 15,, 1921 "7 SheetsSheet 1 (lttowu Dec. 2, 1 1,517,678

C. J. HOLUB PIPE CORRUGATING AND BENDING MACHINE {i am 672072 65 .I//0Za6 aa W PIPE CORRUGAT'ING AND BENDING MACHINE Filed July 13, 1921 7 Sheets-Sheet 3 m mi C. J. HOLUB PIPE GORRUGATING AND BENDING MACHINE Dec; 2,

Filed July 15, 1921 '7 Shee ts-Sheet 4 E AW wuwioz 67247165 J //0Z z( Dec. 1924- 1,517,678

' c. J. HOLUB PIPE GORRUGATING AND BENDING MACHINE Filed July 15, 1921 7 Sheets-Sheet 5 C. J. HOLUB PIPE CORRUGATING AND BENDING MACHINE '7 Sheets-Sheet 6 Filed July 13, 1921 I. u :ilnI-II Patented Dec. 2, 1924. v

UNITED STATES.

1,517,673 NT OFFICE;

CHARLES a; HOLUZB, or conomnus; onr assronon or ONE-THIRD To w. Lmnncn AND ONE-THIRD TO "A. r. LAMNECK, BOTH or oonumnus, onro.

PIPE connuoa'rme AND nnnnme m'acnmn;

Applicatlon filled mi 1a, 1921. Serial No, 4 4,44

To allwhomz't mycon oerm, j p

Be'it known that CHARLES J. Home, a citizenof; the,United States, residing at Columbus, iii the county of Franklin and State of Ohio, has invented certain new and .useful Im rovements in Pipe Corrugating and Bending Machines, of whichv theiollowing is a specification.

. I This inventionrelatesto aniniprovedma.

chine specifically adapted for the purpose of operating upon sheet metal to produce corrugatedpipe sections or elbowsofthe type commonly employedin] connection with stove, gas rangeior furnace fittings, the pri mary object ,of "the invention beingto ro} vide a machine which will be capable of quickly and accurately completing such pipe sections so that ar'elatively lar e production thereof may be efl'ec'ted infa la or and time sav ng manner over lIlflChlIlGShltllltO employed for this purpose.

The invention consists in theprov-is'ionof a machine capableof receiving suitable lengths of straight =metal pipe sections and in the provision of a 'itoma'tically operating mechanism, including a plurality of radially movable plungers, adapted for the purpose of producing corrugations in said ipe sec.

tions, and to simultaneously bend t e latter into the desired elbow formation, the mechanism provided in the machine being therefore capable of simultaneously corrugating, bendingand locking the free edges 'of'the ipe section so that a completed elbowmay e roduced by the machine during itsnor-j ma cycle of operation.

[Other objects of the invention reside in the provision. of an improved machine of this character wherein is embodied novel mechanism in the-nature of an intermittently movable carriage tot-directing the pipe sections into engagement with the corrugating mechanism, in the provision of automatic means for automatically starting and stopping the operation ofthe machine, inmechanism for properly bending the pipe sections through an-arc ofsubst'antially 90 after the formation of said corrugatlons, the said latter means being further operable to compress the corrugations so formed. in order that a neat, properly. bent and well "finished elbow will be produced and wherein the ad- -jacent edges thereof willlbe locked against relative separation.

With these objects in iew, among others,

the invention further consists in the novel features of construction, combinations f of elements and arran'gementsof arts, herein5 after to be. fully described and pointed out in the claims hereunto a pended. I

In the accompanying di'awings, forming a part of this specification, and in which similar characters of referencedenote likeand correspondin views there'o Fig. 5" is a similar view taken'alongthe somewhat larger scale disclosing more fully one of the radially disposed units of the cor; rugatin'g. mechanism,

Fig. 8' is a sectional view taken through said corrugating mechanism on the line of F ig, 7,

Fig. -9 is a transverse 'sectionalview taken along the plane indicated by the line '9 9 of Fig; 7, i

10' is. an enlarged vertical sectional I parts throughout the'several view disclosing more particularly" the mandrel, carriage and feeding mechanism of the machine, together with the bending arm'construction,

V Fig. 11 .is' a similar" view disclosing the 0 .operatlon of thecOrrugating and bending mechanisms when operating upon a pipe section, Fig. 12 isa detail viewdisclosing a cam collar and the upper ends of the bending arms, i f Fig. 13 is a detail view disclosing'the lap edges of the "corrugating plungers,

Fig.114 is. a sectionalview taken through the clutch structure on the plane indicated by theline I l-140i Fig.1,

Fig..1 5 is a longitudinal sectional view taken through said clutch structureon line 1515 of Fig.14, and I joint construction between the adjacent Fig. 16 is a detail view taken on the line 1e 1c of Fi 15.

Fig. 17 is a side elevation of a hand tool 4 for adjusting the eccentric gear of the corrugating dies.

eferring more particularly to the detalls of the invention and to the structural peculiarities of the specific embodiment thereof disclosed in the drawings, the numeral 1 designates my improved machine in" its entirety. In the art ofmanufacturing sheet metal'ipiping, considerable difiiculty, and expense has hitherto been involved in producing corrugated elbows of the ty e employed in uniting relatively angulary extending pipe se'ctions,of the type employed 7 in conjunction with the flue outlets of va- 2, which may be supported by means of verriou's kinds of heating units. It has been customary heretofore to provide a machine whereby such pipe sections may be first corrugated, and then to take such corrugated sections and place the same in a bending machine forlthe purpose of giving the desired elbow contour thereto. The prior art has thus utilized two separate and distinct machines, while the present'i'nvention provides but a single machine .capable of producing the functions hitherto effected by the specified plurality of the machines, the construction of the machine 1 being such that the operation of producing elbow sections may be expeditiously and simply carried out in the .labor saving, and economical manner, at the same time to produce a finished product whichv will be marked by its superiority, both in ,fi'nish, strength and general efficiency .overthe pipe sections roduced by machines heretofore employed or this general purpose. v

The machine 1 is'formed toinclude a bed tical legs 3.' The upper surface of the bed is provided at one end with spaced bearings 4 and 5, which act to rotatably receive a power shaft-6. The latter in this instance has its outer end equipped with a belt wheel 7 by means of which power may be suitably delivered to the machine to rotate the shaft 6. A spur pinion'8 is mounted upon the shaft 6 to rotate therewith, and this pinion is adapted to mesh with a relatively. enlarged geari9, loosely mounted for rotation about a horizontallyextending countershaft 10. This shaft is mounted for rota- I tionwithin the bearings 4 and 5 at a posiscr ibed,the shaft 33 is capable of shafts 12 are provided with fixed spur gears 15, which mesh with a centrall disposed. drive gear 16, the latter being xed to rotate with the counter shaft 10. It will be apparent, therefore, that upon the rotation of said countershaft motion will be imparted to the gear 16 and thence to the meshing gears 15, which, in turn, operate to effect rotation on the part of the longitudinally extending shafts 12.

As before stated the gear 9 is loosely mounted upon the countershaft, hence use is made of an automatically operable clutch structure 17, which is adapted to connectthe gear 9 with the countershaft 10, in order that the latter may, at regulated periods, be rotated in unison with the power shaft 6.

To this end, the gear 9 is provided, contiguous to its hub, with a longitudinally extending bolt 18, the enlarged head 19 of which being disposed to project to one side of the gear 9 so as to be capable of engaging with the .clutch structure 17. As shown more articularly in Figures 14 and 15, the said c utch structure consists essentially of a sleeve 20, which is slidably mounted upon the counter shaft and is feathered as at 21 to said countershaft so as to be ca able of rotating therewith. Formed in the s eeve contiguous to the periphery thereof is a longitudinally extendmg slot 22, in which is s idably mounted a retractible latch bar 23, the said bar being normally urged outwardly by means of a coil spring 24, which has its movement regulated by means of a lateral projection formed upon said bar. Thus, when the bar 23 res onds to the influence of its spring 24, t e same will be projected outwardly or longitudinally until its movement is curtailed by the engagement of the projection 25 with the annular flange 26 surrounding the sleeve. This 10- cates the latch bar in the path of movement or rotation of the head 19, thus causing the said sleeve, and consequently the countershnft 10 to rotate in unison with the power shaft, and the said countershaft in turn imparts rotation to the gears 15 and their respective shafts.

To control positions of the latch bar 23 the upper end of the bearing 5 has pivoted thereto as at 27 an arm2'8 which is of substantially the shape of a bell crank lever. The outer end of this arm is articulatel connected as at 29 with a link 30, the sai link having its outer end pivotall connected as at 31 with the lower en of a and longitudinally with the shafts 12. By

des oscillated, so as to impact corresponding mechanism to be ereinafter more full a m rotatethe amass, so;

- by its rotationiin a spring 24 into -engagemen end 41, to which a coasprin tiguous to their connection 29 is a shoe 34,

which is provided with a cam surface '35, the latter being adapted for cooperation with a similar surface 36 provided on the projection 25. Thus, when the shaft 33 is rotated so as to raise the shoe 34, itwill be apparent that the latter will be engaged by the projection 25, and by reason of the cam surfaces 35 and 36, the ,latch bar 23 will be retracted against the influence exercised by. its spring 24. Theretraction of the latch bar of course. results in breakingthe driving relationwhich exists between'said latch ban-when the latter is projected, and the head of the bolt 18, a feature which results in stopping the rotation of the countershaft 10. The rotation of the sleeve 20 is positively arrested when the connection between the bar 23 Land the bolt 18 is removed, by employing an adjustable friction band 37. This band is pivotally mounted in connection with the upper end of the bearin 5, and is rovided with relatively ,spac

jaws 38, w ich are capable of receiving a screw 39 carrying a wing nut 40. Manifestly, by adjusting the nut 40, the friction which the band 37 is capable of exercising upon the periphery of the sleeve may be readily regulated. Therefore, by this con-.

struction it will be apparent that when the shoe 34 is elevated, the same will be pro- 'ected into the path of movement of the roection 25,,.and when the surfaces 35 an 36 have been fully. engaged, the latch bar 23 will beretracted; to break the driving relationship between the ear 9 and the sleeve 20. The momentunt -h' the sleeve, gained overcome by th 37,- which operates to sto movement .on of the sleeve while the projection; f isy n'engagement with the sl1oe 34, affeature .wh' lrj insures a positive retention of the -.1atc= bar, Conversely, when the clutchz shaft perated to lower'the shoe 34,;lthe latter is of engagement I with ithe ,p'ro ectr 19. The arm 28 is -proviti This springfhas' itfiul t the frame of mama normal tendency; :of it on the part ofthesh0e34. "This tendency,

however, on the apartf, of the spring 42 subject to there 'lation' exercised thereon by the clutch sha t 33, aswill be hereinafter vided with a wear receiving lining 43','which with i the gear 9, is

may be removed or replaced whenever desired.

The inner frame wall 11 is'formed to include ,a pair of spaced apertured lugs 44,

which are adapted to receive between them the upstanding cars 45 provided upon a metallicba'nd 46, the latter serving as a pivoted bearing to receive the inner end of a longitudinally extending mandrel or core 47. It will be observed. that the mandrel 47 be properly maintained in any desired posi- J tion of axial adjustment. It will of course be understood that across pin 50 will ass through thefapertures formed in the ugs 44 and 45 so that the mandrel as a. whole may be pivotally'supported by means of the inner frame wall 11." Provided in the periphery of thein andrel 47 is a longitudinally extendin slot 51; This slot is arranged to slida ly receive a ratchet bar 52,

carryi-n ratchet teeth 53) along its upper edge. 'rranged to move longitudinallyof the mandrel 47 is a slidable carriage 54.

This carriage may be formed to include a;

collar 55, which is suitably slotted toreceive the bar 52; The topof thecollar is provided with a bracket 56, to which is pivoted a lever 57,, One end of this lever pivotally carries a downwardly extending stud 58, whichipasses through an o ening provided in the collar and is capa le of entering an annular open ended chamber or socket 59 formed in oneend of the collar 55. As shown more particularly -in Figure 10, this socketis disposed concentrically of themandrel'47 and 'is capable of registering withthe opening '48 provided in the outer frame wall 14, when the carriage is moved to its extreme outer position'upon the mandrel. By locating the socket 59 in the position 'disclosed, the same will be capable of receivingyone end of a SdtiOIi-(ii);

straight metallic pipe T0," hold the pipe section in connection withthecollar the lever 57 is pivotally conected a's at 6'1 with an upstanding lever 62,

' "*.tl 1e; latterfbeing'provided at its lower end j-witha eam'surface 63eapableof engaging V -w-ithal similar surface 64 provided upon the collar '55. The-lever.- 62 .is also provided with a, 's pringb5 which terminates at its lower end: in anofi'set shoulder'66, the latter bein disposedf foren gement wit-ha similar' s oulder Jprovid upon "thempper end of a latch pin 67.- This pin'is mounted for vertical movement {within an opening; 68

provided in the collar, and the lower end the upstanding lever 62, the stud 58 will be pressed intoengagement with the end of the pipe section within the socket 59, thereby positively retaining said pi e section in connection with the collar, tie cam surfaces 63 and 64 serving to effectively retain the lever 62 in its adjusted position. Simultaneousl withthe clamping of the pipe section, the atch pin 67 is elevated, aga nst the tension of its spring 69, fromengagement with the ratchet teeth 53, thus freeing the collar from locked engagement with the ratchet bar, so that the collar or carriage ma be shifted inwardly and longitudinally o the mandrel 47 carrying the pipe section in unison therewith.

When the carriage has been moved by a manual operation to its extreme inward position, the springlatch65 is en aged'by the outer end of a fixedpin 70, w ich pro ects longitudinally from the inner frame wall 11. This forces the said spring latch 65 out of enga ent-withthe pin 67, so" that the latch pm '67 is released from engagement "therewith, thus allowing the pin 67 to respond to the actiono'f its spring 69 so that the lower end thereof may be forced into engagement with the vertical walls .of the ratchet teeth 53, as is clearly shown in ligure.10.- When the latch pin is thus lowe the clutch structure 17 is automatically operated so as to effect reciprocation on the part of the bar52', in order that the carriage will be intermittentlylfed longitudinally of the mandrel in an outward direction, so that the pipe section carried by the carriage may 1 be subjected tothe action of the corrugatin mechanism hereinafter to be fully'describe Toautomatically operate the clutch struc- 1 -ture, -the.i.collar is provided with a laterally extending 'fixed lug 71, in which is mounted a longitudinally extending, adjust- ;able' set screw 72. This screw is so positio'ned thattho samewill be enabled to enter a bifurcatedlug 73 projecting from the wall 11. ;Slidab1ymounted between the walls of the lug 73' and a similarlu 74 provided u n the outerwalh is a sli ing frame 75,

-w ich extends parallel with the mandrel 47,

and includes a longitudinally dis osed bar 76 and vertically disposed heads 7 the latter being slidably received between the walls of the lugs 73 and 74. The head 77 adj aoent to the inner wall 11 is arranged to be engaged by the end of the set screw 72, in or-' provided in the inner wal 11.

toreturn the ratchet bar to its norma der that when the carriage reaches its extreme inward position, the frame will be reciprocated. The lower portion of the head 77, situated near the wall 11, is rovided with a cam surface, which is capab e of engaging with a similar cam surface provided upon a fixed crank 78, which is carried by the clutch shaft 33. Manifestl the engagement of the set screw 72 with the head 77 will result in oscillating the upper end of the crank 78 outwardly, thus causing artial rotation on the part of the clutch s aft 33, which in turn serves to operate the members 28 and 30, so that the shoe 34 will be.

moved to a position permitting of the projection of the latchbar 23, thus insuring rotation .of the countershaft 10, and consequently the rotation of the intermediate gear 16 and the outer ars 15.

The intermediate gear as shown in Figure 16, is provided with an adjustable cam member 79, capable of being retained in various circumferentiall adjusted positions by means of screws 80. %he cam member 79 has its substantially V-shaped operating projection so positioned as to engage with the inner beve ed end of the ratchet bar 52, which latter projects throu h an o ning 81 t will be observed that the outer end of the ratchet bar includes a depending projection 82, which operates in a slot-83 provided in the mandrel 47, and a s ring 84 is situated to engage with the sai projection so that the ratchet bar will be normally forced in an inward direction toward the gear 16. Manifestly, upon each complete rotation on the part of the gear 16, the cam member 79 carried thereby will enga with the inner end of the ratchet bar so that the latter will be forced outwardly and longitudinally against the resistance offered by the spring 84, and that after engagement between the ratchet bar and the cam member 79 has been broken, the said spring 84 will 0 erate s1- tion. -This reciprocation on the part 0 the ratchet bar results in causing the carriage 54 to be intermittently advanced longitudinally of the mandrel, since the pin 67 will cooperate with said ratchet bar in a manner admitting of this function. It will also be observed that the collar 55 is connected with the upper end of a chain 85, which passes overa fixed sprocket 86, and has its lower end connected with a weight 87, the latter being dis osed for o ration within a rigid tube 88, epending rom the bed 2. By the provision of the weight 87, it will be apparent that when the lever 62 is operated to release the pin 67 from engagement with the ratchet bar, the collar or carriage will be automatically moved inwardly and longitudinall of the mandrel by the action of the weig t, thus rendering the machine manually convenient to operate.

, outward movement and also of a similar Outward movement on the part of the collar is of course elfected by the automatic power driven mechanism previously described.

Moreover, by the provision of the sliding 7 5, thus releasing the crank 78, and permit-' ting the clutch structure to return to its normal inoperative position by reason of the influence exercised by the spring 42. This construction, therefore, admits of an automatic starting of the' carriage in its stopping .of the carriage when the same reaches its extreme position of outward movement.

The corrugating mechanism embodied the machine Ihas been specificallyillus.

trated in Figures 6 to 9 inclusive, and in this particular form of the invention, it, will be observed that the outer ends of the .longiA tudinally. extending shafts 12 upon which the gears 15 are mounted, terminate in sockets 90 provided in the outer frame wall 14 of the machine. The outer ends of the shafts 12 are of reduced pol gonal formationand are adapted to be recelved within pockets 91 provided in collars 92 which are rotatably journaled in thesockets 90. The outer ends of the collars 92 are provided with crank pins or eccentrics 93 of relatively reduced construction, which are adapted to receive surrounding bushings 94, the latter being positioned within openings provided there for in radially disposed eccentric straps-95.

These straps are situated so as to lie in radialpositions with respectto the axis of i the mandrel 47, and are provided with split ends 96 capable of being united by means of screws .97. By tightening the latter, the

bushings 94 will be tightlv held within the said straps, so that upon the rotation of the shafts 12 reciprocatory radial movement will be imparted to the straps 95 by the action of the eccentrics 93. ,The: inner ends-of the straps 95 terminate in substantially circular heads 98, which are arranged to be received within sockets 99 provided in sliding cross heads 100. These cross heads-are arranged for radial movement within fixed guides 101, carried by theouterframe wall 14. The

cross headsare fitted with removable plates .102, which operate to retain the heads 98 .within the sockets 99. Also, the eccentrics 93 are equipped with removable cap, plates 103, which serve to retain the bushings 94 against accidental displacement. It will be observed that the bushings 94 11ave their peripheries provided with gear teeth 104, and that the straps95 are equipped with openings105. By this construction a suitable tool may be inserted within the openings 105 for, engagement with the gear teeth 104, whereby the bushings may be rotatably adjusted so that thecross heads 100 may have their operative positions adjusted relatively to the longitudinal .axis of the machine. Preferably, the guides 101 are of dovetail construction in order to effectively retain the cross headstherein.

The inner edges of the cross heads 100 are provided with recesses 106, in whioh are positioned and secured by means of screws 107, corrugating dies 108. These dies ire of segmental formation and are formed to include relatively reduced inner corrugating edges 109, each of which being approximately 90 curvature. Theyadjacent edges of the dies are formed toinclude lap joints 110, which serve to maintain proper registration between the dies in all oftheir various radial positions. The outer end of the mandrel 17, where it projects ,through the opening 48, is provided ,with a removable forming head 1 11, suitably provided with an annular recess 112,'where it registers with the edges .109 of the corrugating dies, In operation the pipe section 60 is slipped over the mandrel and connected with the carriage as previously described, the forming head 111 being of a diameter to correspond substantially with the inner diameter of the pipe 9 section. Accordingly, the head 111 is re movably connected with the outer end of the mandrel in order that the machine maybe adapted to pipe sections of varying diameter. The extreme outer end of the pipe section, before the latter'is inserted into the machine, is provided with aremovable cam ring 113, which ring is formed to include an annular chamber 114, into which the outer end of the pipe section is inserted or positioned, the

width of the cam ring being such that when the carriage has been moved to its extreme inner position, the inner edge of the cam ring will be positioned contiguous to the forming head 111, but free from conflict with the radially moving reciprocal dies 108. Therefore, it will be apparent that when the clutch structure .17 has been activelyv operated by the inward movement of the carriage, radial reciprocating movelnent will be imparted to the dies 108, thus forcin the latter into engagement with the longitudinally traveling pipe section, and the extent of movement of such dies is such as to produce the desired annular corrugations withinthe pipe section, and these corrugations are successively formed by the intermittent outward moveforced inwardly the same will operate to,

produce the desired circular grooves in the ipe sections, which will be 'smooth umfbrm and accurately finished and perfectly annular in formation.

' Immediately following the corrugating operation, mechanism has been provided for automatically bending the said pipe sections through an arc of substantially 90 so that corrugated pipe elbows of desired physical characteristics may be produced. To this end the bed 2' is provided with spaced brackets 115,;which operate to-rotatably receive shaa 116. This shaft is formed to include a pair ofspaced upwardly extending bending arms 117, which are spaced apart a sufficient distance to permit of the. passage of the cam ring or collar- 113 therebetween,

the extreme upper ends of said arms being provided with removable hardened steel, offset walls 118,-which are so situated as to engage, as shown in Figure 11, with cam win s 119 rovided on the ring 113. Manifest, y, as t e pipe sections'are fed outwardly by the machine and-corrugated through the instrumentality of the dies 108, the cam wings of the collar 113, carried by the outer ends of the pipe sections, will enga e with the walls '118 of the arms 117- so t at the pipe sections will be bent or curved to assume the construction particularly disclosed I in Figure 11.

In order that the corrugations'may be tightly forced together so that the pipe section may be bent or curved the shortest possible radii, the shaft 116 includes a recessed depression 120, in which is positioned the free end of the pivoted pawl 1 21, the latter being pivotally mounted as at -122 within thebifurcated upper end of a throw arm 123. This arm carries an offset bracket 1% between which and the outer crank end of the pawl 121 a spring 125 is confined, the

said spring normally operating to maintain the pawl in contact with the depression 120.

It will be manifest that the arm 123 is loosely mounted upon the shaft 116, and that the arms 117 are fixed to said shaft. Wherefore, by the oscillation of the arm 123, the said pawl willserve to partially rotate the shaft 116 and thusto impartmovementto the upper ends of the arms 117 This movement causes the offset portions 118 of said arms to engage with the'wings 119 provided upon the cam ring 113, thus delivering successive blows to the said cam ring immediately following the formation of each corru' gation in the pipe section, a feature which results in properly bending said pipe sec tions within short compass and also in look ing the free edges thereof against separa tion.

Many different constructions may be used for oscillating the arm 123. For instance as shown in Figure 3 particularly one of the shafts 12 is formed to include a fixed cam '126. This cam is disposed for en agement with the free upper end of a ever 127, the latter being pivoted as at 128 to the under part of the bed 2, the lower end of said lever is disposed for engagement with a sliding plunger 129, which is horizontally reciprocated in a bearing 130 arovided in conjunction with the bed 2. he outer end of the plunger engages with an adjustable screw 131 mounted and secured within the lower end of the arm 123, and a spring 132 operates to maintain engagement between the end of the screw 131 and the outer end of the plunger 129. Manifestly, the cam 126 may be so positioned that its effective surface will be brought into engagement with the lever 127 at timed intervals, which may be so regulated as to oscillate the arm 123 and the associated arms 117 immediately following the formation of each corrugation within a pipe section.

The clutch shaft 33 extends through and beyond the outer frame wall 14, and is equipped with a finger'133, This finger is ca able of engagingat timed tintervals with a aterally extending projection or bar 134 carried by the outer end of the pawl- 121. Thus, when the collar or carriage has moved to it extreme outer osition b the action of its feeding mechanism, the s iding frame will be operated to throw the clutch structure to its inacti've'position. This results in oscillation on the part of the clutch shaft by reason of its response to the infl uence oftthe spring 42.? This movement results in causino downward movement of the finger 133, WlllCll by en aging with the rojection 134, raises or li ts the inner en of the pawl 121 out of the depression 120, thereby allowing the arms 117 to gravitate automatically to a lowered sition, so that facility may be obtained in effecting the final removal of the completed pipe section. Similarly, the arms are automatically elevated after a pipe section has been properly inserted in the machine. complished by (providing the frame walls with a longi-tu inally extending rod 135, which carries a slidably mounted sleeve 136, the latter being formed with an ofl'set projection 137, the outer end of which carryin a, set screw 138, capable of engaging witfi This may be acthe collar 55, when the latter has been moved to its extreme inward position. The sleeve 136 carries a lateral extension 139, to which is pivotally connected a link140, the saidlink extending rearwardly and is connected as at "141 with the upper end of a crank arm 142, fixed to the outer end of the shaft 116.. Therefore, by reason of this construction, when the pipe section has been properly inserted into the machine, the arms 117 will be automatically elevated for engagement with the cam ringlof the pipe section andto effect a bending or curving of said section in the manner disclosed.

In view of the foregoing description, taken in conjunction with the accompanying drawings, it will apparent that the present invention provides a machine which will be capable of efficiently, easily and rapidly producing in comparatively large numbers corrugated and curved metallic pipe sections, or flue elbows as the'case may be. The machine has been formed to include various adjustments, whereby the same may be adapted to accommodate various sized pipe sections, and thus to enable the machine to produce pipe sections of all standard diameters. This feature is insured by the ease with which the collar 55 may be replaced, the adjustment afforded by the bushings 94 for regulating the radial operating positions of the dies 108, and the movable head 98. By these three adjustments the machine may be readily adapted to a pipe section of any desired diameter. The dies 108 are also removably connected with the cross heads 100, a feature which enables the said dies to be readily replaced or repaired when worn or broken. The radially movable dies operate to produce uniform corrugations within the pipe sections, and the'action of the arms 117 serves to properly bend the said pipe sections, to compress t-he corrugations produced by the dies. and to lock the free edges of the pipe sectionstogether. It will be apparent that in removing or inserting a pipe section from or within the machine, the arms 117 will automatically assume a lowered position which will render the end of the machine readily accessible.

I have illustrated in the drawings and described herein the construction which at the present time seems a preferable embodiment of my invention, but I do not limlt myself to the construction shown and de scribed but desire the benefit of all variations of construction and modifications thereof which express the spirit of my invention.

What is claimed is:

1. In a pipe forming machine, a frame, a longitudinally movable carrier mounted in connection with said frame and capable of receiving the end of a metallic pipe section, means operating to intermittently advance saidcarrier and the pipe section carried thereby longitudinally of said frame, a plurality of pipe corrugating' members arranged circumferentially upon said frame about said pipe'section and mounted in fixed guides upon said frame to move radially relative to said pipe section, separate power driven shafts to-actuate said respectivecorrugating members, each provided with a crank pin, an eccentric sleeve rotatably mounted upon said crank pin, and a pitman connected to the corrugating member at one end and relea-sably clamped upon its eccentric sleeve at the opposite end, whereby each corrugating member is readily independently radially adjustable to provide for corrugating pipe sections of different diameters upon the same machine.

2. In a pipe forming machine, a frame including spaced vertically situated inner and outer walls a core carried by said inner wall and having the outer end thereof arranged to project through an opening pro Vided in the outer wall, a carrier interchangeable with other carriers of different external diameter detachably mounted upon said core for intermittent longitudinal movement thereon, means carried by said carrier to detachably connect a pipe section thereto to .feed the pipe section with said carrier longitudinally of said core, an annular former member interchangeable with other former members of different external diameter stationarily mounted upon said core at a position where corrugations are to be formed in the pipe section, a plurality of circumferentially arranged and radially movable power driven corrugating dies, separate driving shafts for said respective corrugating dies, and means to independently adjust said corrugating dies to and from said core to provide for interchangeably producing pipe elbows of different diameter upon the same machine.

3. In a pipe forming machine, a frame including spaced vertically situated inner and outer walls, a core carried by said inner wall and having the outer end thereof arranged to project through an opening pro vided in the outer wall, a carrier interchangeable with other carriers of different external diameter detachably mounted upon said core for intermittent longitudinal movement thereon, means carried by said carrier to detachably connect a pipe section thereto to feed the pipe section with said carrier longitudinally of said core, an annular former member interchangeable with other former members of different external diameter stationarily mounted upon said core at a position where corrugations are to be formed in the pipe section, a plurality of circumferentially arranged and radially movable power driven corrugating dies, having their ad- ,ad ust said corrugating jacent ends overlapping one another, separate driving shafts for said res ective corru ating dies, and means to in ependently dies to and from said core to provide for mterchangeably producing pipe elbows of difierent diameter upon the same machine.

' 4. In a pipe forming machine, a frame including spaced vertically situated inner and outer walls, a core carried by said inner wall and having the outer end thereof arranged to project through an opening provided in the outer wall, a carrier interchangeable with other carriers of difierent external diameter detachably mounted upon said core for intermittent longitudinal movement thereon, means carried by said carrier to detachably connect a pipe section thereto to feed the pipe section with said carrier longitudinally of saidcore, an annular former member interchangeable with other former members of different external diameter stationarily mounted upon said core ata position where corrugations are to be formed in the pipe section, a plurality of circumferentially arranged and radially movable power driven corrugating dies, separate driving shafts for said respective dies, each provided with a crank pin, an eccentric sleeve rotatably mounted upon said crank pin and adjustably clamped in one end of a pitman, the other end of which pitman is connected to said corrugating die to provide for independently adjusting said corrugating dies to and from said core to enable pipe elbows of different diameter to be produced upon the same machine.

In testimony whereof I afiix my signature.

CHARLES J. HOLUB. 

